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drm/amd/display: Implement PQ curve based on output transfer function

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Refactor part 5 - Regamma programming should be dependent on Output
transfer function type

Program sRGB gamma or PQ transfer function based on output transfer
function.

Signed-off-by: Anthony Koo <anthony.koo@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Anthony Koo 2016-12-16 12:12:03 -05:00 committed by Alex Deucher
parent c5ea922237
commit e63d86dc9b
3 changed files with 92 additions and 7 deletions
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93
drivers/gpu/drm/amd/display/dc/calcs/gamma_calcs.c
View File

@ -791,6 +791,82 @@ static inline struct fixed31_32 calculate_oem_mapped_value(
max_index);
}
static void compute_pq(struct fixed31_32 in_x, struct fixed31_32 *out_y)
{
/* consts for PQ gamma formula. */
const struct fixed31_32 m1 =
dal_fixed31_32_from_fraction(159301758, 1000000000);
const struct fixed31_32 m2 =
dal_fixed31_32_from_fraction(7884375, 100000);
const struct fixed31_32 c1 =
dal_fixed31_32_from_fraction(8359375, 10000000);
const struct fixed31_32 c2 =
dal_fixed31_32_from_fraction(188515625, 10000000);
const struct fixed31_32 c3 =
dal_fixed31_32_from_fraction(186875, 10000);
struct fixed31_32 l_pow_m1;
struct fixed31_32 base;
if (dal_fixed31_32_lt(in_x, dal_fixed31_32_zero))
in_x = dal_fixed31_32_zero;
l_pow_m1 = dal_fixed31_32_pow(in_x, m1);
base = dal_fixed31_32_div(
dal_fixed31_32_add(c1,
(dal_fixed31_32_mul(c2, l_pow_m1))),
dal_fixed31_32_add(dal_fixed31_32_one,
(dal_fixed31_32_mul(c3, l_pow_m1))));
*out_y = dal_fixed31_32_pow(base, m2);
}
static void build_regamma_curve_pq(struct pwl_float_data_ex *rgb_regamma,
struct pwl_float_data *rgb_oem,
struct pixel_gamma_point *coeff128_oem,
const struct core_gamma *ramp,
const struct core_surface *surface,
uint32_t hw_points_num,
const struct hw_x_point *coordinate_x,
const struct gamma_pixel *axis_x,
struct dividers dividers)
{
uint32_t i;
struct pwl_float_data_ex *rgb = rgb_regamma;
const struct hw_x_point *coord_x = coordinate_x;
struct fixed31_32 x;
struct fixed31_32 output;
struct fixed31_32 scaling_factor =
dal_fixed31_32_from_fraction(8, 1000);
/* use coord_x to retrieve coordinates chosen base on given user curve
* the x values are exponentially distributed and currently it is hard
* coded, the user curve shape is ignored. Need to recalculate coord_x
* based on input curve, translation from 256/1025 to 128 PWL points.
*/
for (i = 0; i <= hw_points_num; i++) {
/* Multiply 0.008 as regamma is 0-1 and FP16 input is 0-125.
* FP 1.0 = 80nits
*/
x = dal_fixed31_32_mul(coord_x->adjusted_x, scaling_factor);
compute_pq(x, &output);
/* should really not happen? */
if (dal_fixed31_32_lt(output, dal_fixed31_32_zero))
output = dal_fixed31_32_zero;
else if (dal_fixed31_32_lt(dal_fixed31_32_one, output))
output = dal_fixed31_32_one;
rgb->r = output;
rgb->g = output;
rgb->b = output;
++coord_x;
++rgb;
}
}
static void build_regamma_curve(struct pwl_float_data_ex *rgb_regamma,
struct pwl_float_data *rgb_oem,
struct pixel_gamma_point *coeff128_oem,
@ -1286,7 +1362,8 @@ static bool convert_to_custom_float(
bool calculate_regamma_params(struct pwl_params *params,
const struct core_gamma *ramp,
const struct core_surface *surface)
const struct core_surface *surface,
const struct core_stream *stream)
{
struct gamma_curve *arr_curve_points = params->arr_curve_points;
struct curve_points *arr_points = params->arr_points;
@ -1301,7 +1378,6 @@ bool calculate_regamma_params(struct pwl_params *params,
struct pixel_gamma_point *coeff128_oem = NULL;
struct pixel_gamma_point *coeff128 = NULL;
bool ret = false;
coordinates_x = dm_alloc(sizeof(*coordinates_x)*(256 + 3));
@ -1341,9 +1417,16 @@ bool calculate_regamma_params(struct pwl_params *params,
setup_distribution_points(arr_curve_points, arr_points,
&params->hw_points_num, coordinates_x);
build_regamma_curve(rgb_regamma, rgb_oem, coeff128_oem,
ramp, surface, params->hw_points_num,
coordinates_x, axix_x_256, dividers);
if (stream->public.out_transfer_func &&
stream->public.out_transfer_func->tf == TRANSFER_FUNCTION_PQ) {
build_regamma_curve_pq(rgb_regamma, rgb_oem, coeff128_oem,
ramp, surface, params->hw_points_num,
coordinates_x, axix_x_256, dividers);
} else {
build_regamma_curve(rgb_regamma, rgb_oem, coeff128_oem,
ramp, surface, params->hw_points_num,
coordinates_x, axix_x_256, dividers);
}
map_regamma_hw_to_x_user(coeff128, rgb_oem, rgb_resulted, rgb_user,
coordinates_x, axix_x_256, &ramp->public, rgb_regamma,

3
drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
View File

@ -303,7 +303,8 @@ static bool dce110_set_output_transfer_func(
opp->funcs->opp_power_on_regamma_lut(opp, true);
if (ramp && calculate_regamma_params(regamma_params, ramp, surface)) {
if (ramp && calculate_regamma_params(
regamma_params, ramp, surface, stream)) {
opp->funcs->opp_program_regamma_pwl(opp, regamma_params);
opp->funcs->opp_set_regamma_mode(opp, OPP_REGAMMA_USER);
} else {

3
drivers/gpu/drm/amd/display/dc/inc/gamma_calcs.h
View File

@ -14,6 +14,7 @@
bool calculate_regamma_params(struct pwl_params *params,
const struct core_gamma *ramp,
const struct core_surface *surface);
const struct core_surface *surface,
const struct core_stream *stream);
#endif /* DRIVERS_GPU_DRM_AMD_DC_DEV_DC_INC_GAMMA_CALCS_H_ */